Re: -j6 build

[Jean-Marc Saffroy <jean-marc.saffroy@joguin.com>]

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On 08/24/2010 06:33 AM, Mike Stump wrote:
> So, I have a cgen port and am wondering, is there anyway to speed up the 6 minute build that uses 1 core, to being a 1 minute build that uses 6 cores?  -j8 didn't seem to do it.
> 

FWIW setting CC="ccache gcc" and CFLAGS="-O0 -pipe" at configure time
did wonders for me (in addition to make -jN with N = 2 x number of
cores). Also I issue a single make command for all targets.

See attached makefile, which builds a complete toolchain (binutils, gcc,
newlib, and gcc for newlib).

Binutils (cgen, gas, ld, sim) now build in 36 seconds on my quad core
(44secs user, 34secs sys), with hot caches.

HTH,
JM

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# Makefile for the whole bare-metal C toolchain (binutils, gcc, newlib)

# arch name
target ?= xxx
TARGET ?= $(target)-elf

# install dir
DESTDIR = /tmp/$(target)

# build dirs
BUILDROOT = $(HOME)/build/$(target)
SRCBUILDDIR = $(BUILDROOT)/binutils
LIBBUILDDIR = $(BUILDROOT)/newlib
GCCELFBUILDDIR = $(BUILDROOT)/gccelf
GCCLIBBUILDDIR = $(BUILDROOT)/gcclib

# source dirs
GCCDIR = $(HOME)/gcc/src
SRCDIR = $(HOME)/cygnus/src

# build flags
BUILD_CC = ccache gcc
BUILD_CFLAGS = -g3 -O0 -Wall -pipe
SRCMAINT = --enable-maintainer-mode --enable-cgen-maint
GCCMAINT = --enable-maintainer-mode --enable-checking
LIBMAINT =

# misc
export PATH := $(DESTDIR)/bin:$(PATH)
NPROCS := $(shell getconf _NPROCESSORS_ONLN)
NJOBS := $(shell expr $(NPROCS) '*' 2)
TOUCH = touch
MK = make -j $(NJOBS)

all: gcclib-make

# binutils

binutils-configure:
	mkdir -p $(SRCBUILDDIR)
	cd $(SRCBUILDDIR) &&							\
	CC="$(BUILD_CC)" CFLAGS="$(BUILD_CFLAGS)"				\
	 $(SRCDIR)/configure --target=$(TARGET) $(SRCMAINT) --prefix=$(DESTDIR)
	$(TOUCH) $@

binutils-make: binutils-configure
	$(MK) -C $(SRCBUILDDIR) $(patsubst %,all-%,binutils gas ld sim)
	$(MK) -C $(SRCBUILDDIR) $(patsubst %,install-%,binutils gas ld sim)
	$(TOUCH) $@

# initial gcc

gccelf-configure: binutils-make
	mkdir -p $(GCCELFBUILDDIR)
	cd $(GCCELFBUILDDIR) &&						\
	CC="$(BUILD_CC)" CFLAGS="$(BUILD_CFLAGS)"			\
	 $(GCCDIR)/configure --target=$(TARGET) --prefix=$(DESTDIR)	\
	 --enable-languages=c --disable-libssp --with-newlib
	$(TOUCH) $@

gccelf-make: gccelf-configure
	$(MK) -C $(GCCELFBUILDDIR)
	$(MK) -C $(GCCELFBUILDDIR) install
	$(TOUCH) $@

# newlib

newlib-configure: gccelf-make
	mkdir -p $(LIBBUILDDIR)
	cd $(LIBBUILDDIR) &&							\
	CC="$(BUILD_CC)" CFLAGS="$(BUILD_CFLAGS)"				\
	 $(SRCDIR)/configure --target=$(TARGET) $(LIBMAINT) --prefix=$(DESTDIR)
	$(TOUCH) $@

newlib-make: newlib-configure
	$(MK) -C $(LIBBUILDDIR) CC_FOR_TARGET=$(TARGET)-gcc \
	 all-target-newlib all-target-libgloss
	$(MK) -C $(LIBBUILDDIR) CC_FOR_TARGET=$(TARGET)-gcc \
	 install-target-newlib install-target-libgloss
	$(TOUCH) $@

# gcc for newlib

gcclib-configure: newlib-make
	mkdir -p $(GCCLIBBUILDDIR)
	cd $(GCCLIBBUILDDIR) &&						\
	CC="$(BUILD_CC)" CFLAGS="$(BUILD_CFLAGS)"			\
	 $(GCCDIR)/configure --target=$(TARGET) --prefix=$(DESTDIR)	\
	 --enable-languages=c --disable-libssp --with-newlib		\
	 --with-headers=$(DESTDIR)/$(TARGET)/include
	$(TOUCH) $@

gcclib-make: gcclib-configure
	$(MK) -C $(GCCLIBBUILDDIR)
	$(MK) -C $(GCCLIBBUILDDIR) install
	$(TOUCH) $@

# run gcc test suite

check: gcclib-make
	$(MK) -C $(GCCLIBBUILDDIR)/gcc check \
	 RUNTESTFLAGS="--target_board=$(target)-sim $(RUNTESTFLAGS)"
	tail $(GCCLIBBUILDDIR)/gcc/testsuite/gcc/gcc.log
# clean

clean:
	$(RM) -r *-configure *-make $(DESTDIR) $(BUILDROOT)

.PHONY: clean all check